Concrete foot for wooden poles



Aprill, 1930. F. Nn'zscHE CONCRETE FOOT FOR WOODEN POLES Filed Jan. '14, 1924 [nre/)mr EVV/72:50h@

l ,w f

Patented Apr. 1, 1930 PATENT oFFlcE FRITZ NITZSGHE, OF KARLSRUHE, GERMANY CONCRETE FOOT FOR VWOODEN POLES Application led January 14, 1924. Serial No. 686,171.

The present invention relates to an improvement in feet for wooden poles which are intended to lengthen considerably the period during which they can be used compared with poles which are xed in the ground.

In contrast to the forms of construction hitherto lrnown, in which iron is chiefly used, the object of the present invention consists entirely or in great part of reinforced concrete.

'Ihe advantage of this is that the new pole feet can be produced much more cheaply and be maintained with less expense. The form 5 and arrangement of the new foot enable the poles to be adjusted and exchanged in a simple and reliable manner Without the employment of any auxiliary means. The principal advantage of the new arrangement is that the poles are only fastened at two points, and that air and light can freely enter in all parts of the pole ends thus fixed, so that the end of the pole dries quickly after rain.

The object of the present invention is illustrated in dierent forms by way of example in the drawing.

Figs. l and 2 are two views of a third form of construction situated at 90 in relation to one another.

Figs. Sand 4 are corresponding sections, the latter being on a larger scale.

Figs. 5 and 6 are two side elevations situated at 90 in relation to one another.

Figs. 7, 8 and 9 are corresponding sections.

3 The form of construction illustrated in Figs. l to e consists of two gripping arms I), between which the pole c is clamped. On the gripping arms b extensions l are arranged 4G on which the pole c stands. For the secure fixing of the pole c in the gripping device, a pin e notched at its lower end engages in triangular openings in the extensions cl. In consequence of the triangular form of the penings the contact between the pin e and the extensions CZ is very slight in order that any water that enters can How out again at once. The fixing of the pole in the arm is effected by means of the screw bolts ,t and g. The base of the pole may be composed of a number of parts, two parts for example,

adapted to contact with one another. In order that in the case of lateral stress the halves of the base may not be able to move in relation to one another, contacting faces are moreover indented and so related to the pole that they are normally apart adjacent the upper ends and must be drawn together against the pole for securing the latter.

For the obj ect of securing weight the base a may not be solid but of hollow or channel construction. Since the foot is under considerable tension at the point in the lower end where it comes out of the ground, it is desirable that this particular part should be of solid cross-section.

With the tension bolts f and g washers o are employed, the bent ends ofwhich engage in suitable recesses in the partsof the base to be joined. In the form of the invention according to Figs. l to 4, the armsA are joined at their lower ends by a hinge n on the lower end and provided with clamping jaws g (Fig. l) on their upper ends. In this case the gripping devices form the underparts, which are so connected with one another on the base by bolts r that in consequence of the hinge formation they can be turned in relation to one another. At the upper end the pole c is engaged by the clamping jaw compressed by means of the screw bolt f, the form of which so is to be seen from Fig. 3 at the lower end it stands on the extensions Z and is-further held by the bolt g.

In loose ground the employment of the form of the invention according to Figs. 1 85 and 2 involves certain difficulties on account of the small surface of the buried portion or foot. In this case therefore the forms of another invention may be suitably employed.

Also rods for wires have to be carried along the railway or streets,it happens frequently that the place for setting up these rods is very limited and if rows of conductors run over iield parallels the feet of the poles must be inserted in the direction of the edges or borders of the fields. In such cases it is advisable to employ pole feet, the two halves of which have not the pole between them, but the two arms of the foot are put together so that the post is fixed laterally to these. This pair of concrete arms supported against each other adjacent their lower ends, having jaws adjacent their upper ends constructed to clampably engage said mast at separated points, for supporting the same, and means for compressing said arms passing through apertures in said arms.

In testimony whereof I aiix my signature.

FRITZ NITZSCHE.

For preventing moving in relation to one another the seam n between the two halves of the foot is packed. (See Figs. k5 to 8). For the purpose of economizing weight the halves of the foot are made U-sh'ape so that they form a hollow body (Figs. 7 and 8). rllhe xing on the foot of the pole 0 set upon the extension el is eected by means of two iron straps 7 and g, the two ends of which furnished with screw-threads engage in the angular washers t of the two upper connecting screws u and are there put under tension according to requirements by means of screwnuts 21. Lateral movements of the pole are l prevented by the jaws Q and g.

In consequence of the action of the winds powerful vibrations are very frequently produced in the poles, which must be transmitted through the bolts f and g to the foot of the pole. With the relatively slight thickness of these bolts the surface of contactbetween these and the concrete is relatively small and consequently it is to be feared that in course of time the bolt holes in the concrete may wear away. 'Io prevent this the bolt holes are lled in with ironftubes (see Fig. 4) which represent a perpendicular section through the jaws g in Fig. 1.

I claim 1. A concrete supporting base for wooden poles, comprising a two part foot, means connecting the parts of the foot so that they Vform a single post, the foot being formed as a hollow body.

2. A concrete supporting base for wooden masts comprising a two-part foot, means con'- necting the parts of the foot so that they form a single post, said means including indented joint surfaces between the two parts of the base, whereby both horizontal and vertical displacement is prevented, the base being formed as a hollow body.

3. A. concrete base for masts comprising, a pair of concrete arms supported against each other adjacent their lower ends, having jaws adjacent their upper ends constructed to clampably engage said mast at separated points for supporting `the same, means passing through apertures in said arms for compressing said arms, said arms being formed adjacent the lower ends with indented joint surfaces whereby both horizontal and vertical displacement of the parts is prevented.

4. A` concrete base for masts comprising a 

